Underfeed stoker



1,625,975 April 2 i927' R. 1.. BEERs UNDERFEED sToKER 'originalmled 06u15, 192s 4 sheets-sheet 1 Y INVENTOR. Q P05/Ce ee BY t j A TTORNEYS April 26 1927. 1,625,975

R. n.. lax-:ERS

` UNDERFEED STOKER Original Filed Oct 15. 1923 '4 shuts-sheet 2 -I N VEN TOR. BY ce A TTORNEY April 26, 1927. R. L. BEERS UNDERFEED sToKER Original Filed OCT- 15, 1923 4 $heets-Sheet 3 l?" f f. A TTORNEYS R. L. BEERSv UNDERFEED STOKER April ze, 1927. l 1,625,975

voriginal Filed oct. 15. 1923 4 sheets-sheetfi Z A a.) $22 INVEN TOR.

ofce 526/15 A TTORNEYS Patented 2%, i922?,

ROYCE L. BEBES, Gli DETRIT, MICHGN, ASSIGNOR T0 DE'IT STQKER COMPANY, 0F DETRQT, MZCHIGAN, A COBPOMTON OFMCEIGAN.

UNDERFEED STOKER.

Application tiled @patcher 15, 1923, Serial No. 668,747. Renewed January 8, i927.

This invention relates generally to stokers and refers more particularly to multiple retort stokers of the so called side dump type'.

@ne of the essential objects of the invention is to provide a Stoker of this character having mechanism for shifting the fuel laterally over the retorts whereby the consumed fuel and 'ash will be positively discharged onto suitable ash receivers at the opposite sides of the furnace. y Another-object of the invention is to provide a stoker of the above mentioned character having the tuyres thereof arranged in a common plane whereby with a given head space a greater combustion space is obtainable resulting in a more complete combustion of the fuel and consequently greater eciency in operation.

Another object of the present invention is to provide an underfeed stoker of the muln tiple retort, side dump type, in which a uniformity exists between the several retorts and between the several tuyres so that it will be practical to carry fewer replacement parts owing to the fact that -an extra retort or tuyre is interchangeable' with any of the retorts and tuyres in use andfconsequently may be used as a replacement for any one of these parts in use which may become hrolren or otherwise incapacitated. This is particularly advantageous als it effects an economy not only in manufacture hut in maintenance., y

Another object of the present invention is to provide a Stoker having the tuyeres arranged in a common plane but having certain areas vof the walls of the retorts or tuyres or of the retorts and tuyeres so shaped as to laterally shift or-direct the fuel toward the side dump plates or ash receivers without any movement of the tuyres relativelyk to the retorts.

A further object is the provision of adjusting means whereln the discharge may' be varied tov obtain a more uniform consumption of fuel and the maintenance of a fuel bed of the desired form.

Another object is to provide a Stoker that is simple in construction, eicient in operation, inexpensive to maintain and economical in the Yuse of fuels e l/V ith the above and other objects in view, the invention consists in certain novel features of construction, combination and arrangement of parts as willbe more fully described and particularly pointed out in the appended claims. A

ln the accompanying drawings Figure l is a front elevation of a Stoker embodying my invention;

Figure 2 is a longitudinal sectional view through the stolzer;v

Figure 3 is across sectional view through the furnace and Stoker mechanism;

- l Figures 4- and 5 are views similar to Figure 3 but showing fewer retorts;

Figures S and are views similar to Figures e and 5 but showing slightly modified constrl'ictionse For the purpose of illustration, l have shown and will describe a .specilic form of Stoker as an embodiment of my invention, but dosnot desire to be limted to the' same, as it will be obvious` that other forms could be employed and various modifications made without departing from the spirit of the invention.

The numeral l designates a plurality of laterally spaced horizontal retorts into which the green fuel is fed from suitable hoppers 2 supported in front of the furnace upon casings 3 in alignment with the retortso The green fuel mag7 be supplied by any suitable means (not s own) to the hoppers and is preferably fed into the retorts byy suitable rams 4 mounted in the casings 3. These rams are reciprocated b pitman rods 5 connected to a rotary eran shaft 6 in front of the furnace by means of blocks 7 rotatively mounted on certain cranks of the shaft and adjustably mounted 'upon the pitrnan rods. The shaft is suitably journaled in a frame 8 secured to the front wall 9 of the furnaceand is driven from suitable transmission mechanism (not shown) housed within u casing l0 upon the frame.-

The fuel is advanced in the retorts by usual pusher blocks 1l mounted upon and actuated by suitable rods 12 connected to the forward ends of the rams e so as to b actuated thereby.

In a Stoker ofthe type specified, it is essenn tial for its proper operation that the ash be wholly and uniformly discharged without loss of fuel and to accomplish this result, l have rovided means whereby the fuel may be shifted graduallyvwhile the Stoker is in operation, Ain the direction of the ash receivers so thatas the latter are approached only the ash will be deposited thereon. The fuel shift .may loel eected bv hand or automatically, either mechanically or by reason ofthe shape of the retorts or tuyres, or both, as will be described and l preferably provide for an adjustment for the fuel shifting mechanism whereby the' discharge of ash may be varied as occasion may require.

For moving the fuel bed laterally automatically mechanically so that the consumed fuel and ash will be deposited upon the ash receivers 15 at the opposite sides of the furnace, l provide a plurality of air tuyres 16 which are preferably shiftable transversely over the retorts. Each series of tuyres are formed of short units 17 of standard construction that have. air openings 18 in the inclined sides thereof and are clamped together in an end to end relation. The intermediate series of tuyeres are slidably mounted upon flanges 19 projecting laterally from the upper edges of the retort, While the outer series of tuyres are slidably mounted upon flanges 2O extending laterally from the outer Walls of the outer retorts as Well as upon horizontal side plates 21 oVerhanging the ash receivers 15. To prevent binding of the tuyeres, l preferably provide lugs or projections 20 at the bottom of the tuyre for spacing the latter from the flanges 20 and plates 21. These projections are in a comparatively cool part of 'the tuyres and should not expand as much as Would the top and hot part thereof. A

. From the description of `the construction thus far it will be apparent that the retorts are' of a substantially uniform construction and furthermore that the tuyres are also a uniform construction and are arranged' in a common plane. By arranging these tuyeres in this manner a greater combustion space above the tuyres is ob tained which results in a more complete combustion of the fuel and consequently in a greater eiiciency. Furthermore, the uniformity in the retorts and tuyres permits of an economy in manufacture and maintenance as was previously pointed out.

For shifting the tuyeres simultaneously, l provide a plurality of rock arms 22 that are connected to the tuyeres and that are mounted upon and actuated by suitable roclr shafts 23 extending longitudinally of the furnace between the retorts. These shafts extend through the front wall 9 of the furnace and are connected at their'forward Yends to suitable rock arms 24 projecting`upwardly between a pair of spaced parallel bars 25 extending across and in front of the hoppers 2. The arms 24 are provided with spaced openings at 'the upper ends thereof that receive pins 26 upon which suitable rollers 27 are mounted for supporting the bars 25 and are adjustably connected to the bars 25 by means of' removable pins 28 that may be adjusted upon opposite sides of the Learner/5 arms into spaced aligned openings 29- in the bars. Thus, the lateral movement of any of the tuyres may be easily and quickly varied as desired to take care of irregular conditions of the fire bed. lf desired, the pins at the opposite sides of any of the rock arms 24 may be removed, entirely so that the tuyres actuated thereby will be permitted to remain idle While the other tuyres are being moved.

For reciprocating the bars 25 to actuate the rock arms 24, l provide another rock arm 30 that isconnected to the bars25 at one end thereof and that is non-rotatively secured to a stub shaft 31 journaled in the frame 8. ln order that the same driving means lmay be used for both the rams 4 and the tuyres 16, the stub shaft 31 isdriven from the crank shaft 6 by means of a rotary cam 32 non-rotatively secured to the shaft 6 and having an inclined face 33 that is adapted to be alternately engaged by the parallel arms 34 of a irl-shaped member 35 non-rotatively secured to the stub shaft 31.

In use, rotation of the crank shaft 6 will impart a reciprocatory movement to the rams 4 and rods 12, which Will cause the periodic feeding and advancing of the fuel in the retorts. Rotation of the crank shaft 6 will also cause the reciprocation of the bars 25 which in turn Will rock the arms 24,A

shafts 23 and arms 22 and Will cause the tuyres 16 to slide transversely so that the consumedfuel and ashes Will be moved over the side plates 21 and onto thel ash receivers 15.

From the foregoing description it will be readily apparent that a positive discharge of the consumed fuel and ash upon the ash receivers is obtained and that by reason of the gradual and uniform discharge the Wasting of green fuel is obviated. lt Will be further noted that through the adjustability. of parts, not only may the discharge ybe lvaried to suit the particular requirements, but any one of the series of tuyres may be made active, in some instances only one movable tuyre being required to accomplish the desired results.

ln Figures 6 and 7 of the drawings a shghtly modified form of construction is illustrated in which the fuel may be shifted laterally toward the ash receivers, automatically, but Without positive mechanical means for accomplishing this. ln this form of construction the inner Walls 36 of the two retorts shown in Figure 6, or of the outer retorts shown in Figure 7, are arranged in a substantially vertical plane while the outer Walls 38 of the said retorts are inclined upwardly and outvvardl. toward the ash receivers 15. lt will furthermore be noted that the walls of the tuyres 16 adjacent to the inclined retort Walls 38 constitute a substantial continuation thereof, being inclined lill) on an angle substantially coincident there-' with. With this form of construction the toward the adjacent'or adjoining ash re-' ceivers. Obviously with this construction the tuyres 16 may either be rigidly fixed in position or if movable may be left at rest in their position as illustrated in Figures 6 and 7 of the drawings. Obviously with this construction of retort if movable tuyres are also employed the fuel may be more readily pushed toward the ash receivers.

What I claim as my invention is 1. In a furnace, an ash receiver at one side thereof, a retort adjacent to one side of said ash receiver, and an air tuyre extending longitudinally of the retort'supported along a longitudinal edge by a longitudinal' Wall of the retort, said tuyre being movable transversely of the retort along the said point of support for shifting consumed fuel laterally onto said ash receiver.

2. In a Stoker, an ash receiver, a plurality of retorts located to one side of said ash receiver, the retorts being in a common horizontal plane, and a plurality of air tuyres slidably supported upon adjacent Walls of adjacent retorts and adapted to be shifted transversely above said retorts for causing travelling of the fuel bed laterally for effecting a ldischarge of ash onto the ash receiversf 3. In a Stoker, the .combination with a retort for fuel, a fuel feeding ram in alignment with the retort, and an actuating connection for said ram comprising a rotatable crank, a pitman connected to the ram, and a block adjustably connected to the pitman and pivotally connected to the crank, of an ash receiver at one`side of the retort, an air tuyre adapted to be shifted above said retort for effecting a discharge of ash onto said ash receiver, and means operated by said crank for shifting said tuyere. y

4. In a Stoker, the combination with a retort for fuel, a fuel feeding ram in alignment with the retort, and an actuating connection for said rain comprising a rotatable crank, a pitman connected to the ram, and a block adjustably connected to the pitman and pivotally connected to the crank, of an ash receiver at one side of the retort, an air tuyre adapted to be shifted above said retort for effecting a discharge of ash onto said ash receiver. a rock shaft, rock arms conneted to said shaft, one being adapted to shift said tuyre, a reciprocatory member connected to the other arm, and means operated from said crank for reciprocating said member to rock said arms and cause said tuyere to be shifteda 5. In a Stoker, a retort for fuel, an air tuyre movable above the retort, a rock shaft, rock arms connected to said shaft, one arm being adapted to move the tuyre relative to the retort, a reciprocatory member connected to the other arm, a rock arm connected to said member, a shaft connected to the last-mentioned rock arm, a U-shaped member carried by the last-mentioned shaft, a rotary crank, and a cam upon the crank having an inclined face alternately engageable by the arms of said U-shaped member for rocking the last-mentioned shaft and arm to reciprocate said member and cause the'first-mentioned arm to be rocked.

6. In a furnace, the combination with a series of parallel retorts extending longitudinally of the furnace, of ash receivers at'the opposite sides of the furnace for receiving the consumed fuel from said retorts, tuyres bridging the spaces between said retorts, and arrangedv in horizontal alignment and means for shifting said tuyeres transversely of said retorts for transferring the consumed fuel laterally of said retorts to saidash receivers.

.7. In a furnace, a fuel bed support comprising a series of parallel retorts extendlng longitudinally of the furnace, adjacent retorts being spaced apart to provide passage of air upwardly between adjacent longitudinal Walls of adjacent retorts from a point below the fuel bed, ash receiving means extending longitudinally of the furnace adjacent the outermost of said retorts, tuyres extending longitudinally of the furnace for bridging the space between adjacent retorts, each of said tuyrcs having slidable supporting engagement with the respective adjacent Walls of adjacent retorts, and means for sliding said tuyres at their said points` of engagement with the retort7 walls transversely thereof for causing the fuel bedto travel transversely of the retorts to the said ash receiving means.

8. In a furnace, a fuel bed support cmupris'rng a series of parallel retorts extending longitudinally of thefurnacc, adjacent retorts being spaced apart to provide passage of air upwardly between adjacent longitudinal Walls of adjacent retorts` from a point below the fuel bed, ash receiving means extending longitudinally of the furnace adjacent the outermost of said retorts, tuyres extending@longitudinally of the furnace for bridging the space between adjacent retorts, each of said'tuyres having slidable supporting engagement with the respective adjacent Walls of adjacent retorts, and means for slidlll ing said tuyres simultaneously in the saine direction at their said points of engagement with the retort, walls transversely thereoi' for causing the uel bed to travel transversely of the retorts to the said ash receiv ing ineans.

9. ln a furnace, a fuel bed support co1nprising a series of parallel retorts extending longitudinally of the furnace, adjacent retorts being spaced apart to provide passage of air upwardly between adjacent longitudinal walls of adjacent retorts itroin a point below the fuel bed, ash receiving ineans eX- tending longitudinally. otthe furnace adjacent the o-uterindt oi said retorts, tuyres extending longitudinally ot the tui-nace tor bridging the/space between adjacent retorts, each of said tuyeres having slidable supporting engagement with the respective adjacent walls of adjacent retorts, and nieans 'tor sliding said tuyres alternately in opposite directions, ali of said tuyeres moving together and in the saine direction, the points ot sliding being at their said points ot enn gagenient with the retort, walls transversely7 thereof tor causing the tuel bed to travel transversely ot' the retorts to the said ash receiving means.

l0. .ln an underteed stoker, a group of longitudinally extending retorts, ash re ccivers at the opposite sides of said group ot retorts and a plurality of tuyeres operatively associated with said retorts and arranged in substantial horizontal alignment.

ll. ln an under'fced stolrer, a group ot spaced parallel. longitudinally extending retorts, ash receivers at the opposite sides ot said group et retorts and a plurality oi tuyres bridging the space between said re torts and arranged in horizontal alignment.

l2. ln an automatic underieed stolrer ot the multiple retort, side dump type, the conibination with a pair ot retoits, oit a. tuyere arranged therebetween and ineans for actuating said tuyre to shift the fuel laterally toward the side duinps,

i3. ln an automatic underleed Stoker o'i the multiple retort, side duinp type, the conibination with a plurality of retoits, of a plurality orf tuyres operatively associated with said retorts and arranged in substantial horizontal alignment, and means tor actuating said tuyeres to shift the l'uel laterally toward the side dumps.

il. ln an underteed Stoker, a pair oi:7 rel'orts, ash receivers at the opposite sides ot said pair ot' retorts and a plurality ot tuyeres mettere operatively associated. with said retorts and arranged in substantial horizontal align nient, each retort being provided with a vertical Wall, and a wall inclined to laterally shift the fuel toward the ash receiver adjacent thereto.

l5. ln an underfeed Stoker, a group ot retorts, ash receivers at the opposite sides ot said group of retorts and tuyres operatively associated with said retorts and arrangedi in substantial horizontal alignment, one wall l ot each retort nearest its adjacent ash re' ceiver having a greater inclination than the adjacent wall to laterally shift thevluel in the direction of the said ash "receiver l 16. ln an undei'eed stolrer ol the side duinp type, a group ot longitudinally eX- tcnding retorts, ash receiving and discharging devices at the opposite sides oit said group ot' retorts and a plurality or" tuyeres voperatively associated with said retorts and tially horizontal alignment tor 'feeding tuel i to a coniinon bed, ash receiving and discharging devices at the sides et said bed and longitudinally extending tuyeres operatively associated with the edges ot said retorts and bridging the space between said retortsE 19. ln an underteed Stoker of the multiple retort side dump type, a group ot laterally spaced longitudinally extending retorts ar ranged in substantially horizontal alignnient with the walls thereof continuous throughout their length, ash receiving and discharging devices at the opposite sides o saie group of retorts and longitudinally en" tending tuyres engaging the longitudinal cdi/es of said retorts throughout their length and bridging the space between said retorts.

ln testimony whereot .l attbi my signature,

norcia il.. ennesitillk llO 

